Agilent Technologies 81480A, 81640A, 81642A, 81680A, 81689A User Manual
...
Agilent 81480A and
Agilent 81680A, 81640A, 81682A, 81642A, & 81689A
Tunable Laser Modules
User’s Guide
S1
Notices
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Warranty
This Agilent Technologies instrument product is
war rante d agains t defect s in m ate rial and workm anship
for a period of one year from date of shipment. During
the warranty period, Agilent will, at its option, either
repair or replace products that prove to be defective.
For warranty service or repair, this product must be
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Assistance
Product maintena nce agreem ents and other cus tomer
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Technologies products. For any assistance contact your
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Certification
Agilent Technologies Inc. certifies that this product met
its published specifications at the time of shipment from
the factory.
Agilent Technologies further certifies that its calibration
measurements are traceable to the United States
National Institute of Standards and Technology, NIST
(formerly the United States National Bureau of
Sta ndar ds, N BS) t o the exte nt allowed by the In sti tutes ’s
calibration facility, and to the calibration facilities of
other International Standards Organization members.
ISO 9001 Certification
Produced to ISO 9001 international quality system
standard as part of our objective of continually
increasin g custome r satisfac tion throug h improved
process c ontrol.
Sixth Edition
81680-90014 E0101
First Edition:
E0599: May 1999
Second Edition:
E1099: October 1999
Third Edition:
E1299: December 1999
Fourth Edition:
E0300: March 2000
Fifth Edition:
E0900: September 2000
Sixth Edition:
E0101: January 2001
Limitation of Warranty
The foregoing warranty shall not apply to defects
resulting from improper or inadequate maintenance by
Buyer, Buyer-supplied software or interfacing,
unauthorized modification or misuse, operation outside
of the environmental specifications for the product, or
improper site preparation or maintenance.
No oth er warran ty is expre ssed or implied. Agilent
Technologies specifically disclaims the implied
warranties of Merchantability and Fitness for a
Particular Purpose.
2 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Safety Summary
WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,
Safety Summary
The following general safety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specific warnings elsewhere in
this manual violates safety standards of design, manufacture, and
intended use of the instrument. Agilent Technologies Inc. assumes no
liability for the customer’s failure to comply with these requirements.
Before operation, review the instrument and manual, including the
red safety page, for safety markings and instructions. You must follow
these to ensure safe operation and to maintain the instrument in safe
condition.
practice or the like, which, if not correctly performed or adhered to,
could result in injury or loss of life. Do not proceed beyond a
WAR N I NG sign u ntil th e indica t ed conditions ar e fully u nd ersto od a nd
met.
Safety Symbols
The apparatus will be marked with this symbol when it is necessary
for the user to refer to the instruction manual in order to protect the
apparatus against damage.
Hazardous laser radiation.
Initial Inspection
Inspect the shipping container for damage. If there is damage to the
container or cushioning, keep them until you have checked the
contents of the shipment for completeness and verified the instrument
both mechanically and electrically.
The Performance Tests give procedures for checking the operation of
the instrument. If the contents are incomplete, mechanical damage or
defect is apparent, or if an instrument does not pass the operator’s
checks, notify the nearest Agilent Technologies Sales/Service Office.
WARNING To avoid hazardous electrical shock, do not perform electrical tests
when there are signs of shipping damage to any portion of the outer
enclosure (covers, panels, etc.).
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 3
Safety Summary
WARNING You MUST return instruments with malfunctioning laser modules to
an Agilent Technologies Sales/Service Center for repair and
calibration.
Line Power Requirements
The Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A,
Agilent 81642A, & Agilent 81689A Tunable Laser Modules operate
when installed in the Agilent 8164A Lightwave Measurement System.
The Agilent 81689A also operates when installed in the Agilent 8163A
Lightwave Multimeter or Agilent 8166A Lightwave Multichannel
System.
Operating Environment
The safety information in the Agilent 8163A Lightwave Multimeter,
Agilent 8164A Lightwave Measurement System, & Agilent 8166A
Lightwave Multichannel System User’s Guide summarizes the
operating ranges for the Agilent 81480A, Agilent 81680A,
Agilent 81640A, Agilent 81682A, Agilent 81642A, & Agilent 81689A
Tunable Laser Modules. In order for these modules to meet
specifications, the operating environment must be within the limits
specified for your mainframe.
Input/Output Signals
CAUTION There are two BNC connectors on the front panel of the
Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, and
Agilent 81642A; a BNC input connector and a BNC output connector.
There is one BNC connector on the front panel of the Agilent 81689A a BNC input connector.
An absolute maximum of ±6 V can be applied as an external voltage to
any BNC connector.
Storage and Shipment
This module can be stored or shipped at temperatures between
−40°C and +70°C. Protect the module from temperature extremes that
may cause condensation within it.
4 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Safety Summary
Initial Safety Information for Tunable Laser Modules
The Specifications for these modules are as follows:
Table 1 Tunable Laser Modules Laser Safety Information
Agilent 81480A Agilent 81680A Agilent 81640A Agilent 81682A Agilent 81642A Agilent 81689A
Laser Type FP-Laser
InGaAsP
Wav elengt h range 1370-1480 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm
Max. CW output power* <15 mW <15 mW <15 mW <15 mW <15 mW <15 mW
Beam waist diameter 9 µm9 µm9 µm9 µm9 µm9 µm
Numerical aperture 0.1 0.1 0.1 0.1 0.1 0.1
Laser Class according to
IEC 60825-1 (1998)- International
Max. permissible CW output
power - IEC**
Laser Class according to
FDA 21 CFR 1040.10 (1995) - USA
Max. permissible CW output
power - FDA**
* Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector.
** Max. permissible CW output power is the highest optical power that is permitted within the appropriate laser class.
3A 3A 3A 3A 3A 3A
50 mW 50 mW 50 mW 50 mW 50 mW 50 mW
IIIb IIIb IIIb IIIb IIIb IIIb
500 mW 500 mW 500 mW 500 mW 500 mW 500 mW
FP-Laser
InGaAsP
FP-Laser
InGaAsP
FP-Laser
InGaAsP
FP-Laser
InGaAsP
FP-Laser
InGaAsP
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 5
Laser Safety Labels
These laser safety warning labels are fixed on the outside of the
Agilent 8164A Lightwave Measurement System before shipment.
Safety Summary
Figure 1 USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A)
These laser safety warning labels are fixed on the outside of the Agilent 8164A
Lightwave Measurement System before shipment.
Figure 2 Non-USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A)
6 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Safety Summary
A sheet of laser safety warning labels are included with the
instrument. You MUST stick the labels in the local language onto the
outside of the instrument, in a position where they are clearly visible
to anyone using the instrument.
Top Vi e w
See page 6See page 6
Figure 3 Position of Safety Labels on Backloadable Tunable Laser Modules
These labels are applied in these positions to every Agilent 81480A,
Agilent 81680A, Agilent 81640A, Agilent 81682A, and Agilent 81642A
Tunable Laser Module before shipment.
See page 6
Figure 4 Position of Safety Labels on Agilent 81689A Tunable Laser Module
These labels are applied in these positions to every Agilent 81689A
Tunable Laser Module before shipment.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 7
See page 6
See page 6
See page 6
Safety Summary
WARNING Please pay attention to the following laser safety warnings:
• Under no circumstances look into the end of an optical cable
attached to the optical output when the device is operational. The
laser radiation can seriously damage your eyesight.
• Do not enable the laser when there is no fiber attached to the optical
output connector.
• The laser is enabled by pressing the gray button close to the optical
output connector on the front panel of the module. The laser is on
when the green LED on the front panel of the instrument is lit.
• The use of optical instruments with this product will increase eye
hazard.
• The laser module has a built-in safety circuitry which will disable
the optical output in the case of a fault condition.
WARNING Refer Servicing only to qualified and authorized personnel.
8 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
The Structure of this Manual
The Structure of this Manual
This manual is divided into two categories:
• Getting Started
This section gives an introduction to the Tunable Laser modules.
and aims to make these modules familiar to you:
– “Getting Started with Tunable Laser Sources” on page 21.
• Additional Information
This is supporting information of a non-operational nature. this
contains information concerning accessories, specifications, and
performance tests:
– “Accessories” on page 31,
– “Specifications” on page 39, and
– “Performance Tests” on page 57.
Conventions used in this manual
• Hardkeys are indicated by italics, for example, Config, or Channel.
• Softkeys are indicated by normal text enclosed in square brackets,
for example, [Zoom] or [Cancel].
• Parameters are indicated by italics enclosed by square brackets, for
example, [Range Mode], or [MinMax Mode].
• Menu items are indicated by italics enclosed in brackets, for
example, <MinMax>, or <Continuous>.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 9
The Structure of this Manual
10 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Tabl e of C o nt e nts
Tab l e o f Co n t e n t s
Safety Summary 3
Safety Symbols 3
Initial Inspection 3
Line Power Requirements 4
Operating Environment 4
Input/Output Signals 4
Storage and Shipment 4
Initial Safety Information for Tunable Laser Modules 5
Laser Safety Labels 6
The Structure of this Manual 9
Conventions used in this manual 9
Getting Started with Tunable Laser Sources 21
What is a Tunable Laser ? 23
Agilent 81480A, 81680A/82A/40A/42A Tunable Laser Modules
24
Agilent 81689A Tunable Laser Module 26
Optical Output 27
Polarization Maintaining Fiber 27
Angled and Straight Contact Connectors 27
Signal Input and Output 29
Accessories 31
Modules and Options 33
Modules 34
User’s Guides 35
Options 35
Option 003 - Agilent 81682A, Agilent 81642A 35
Option 021 - Agilent 81689A 35
Option 022 - Agilent 81689A 36
Option 071 - All Tunable Laser Modules 36
Option 072 - All Tunable Laser Modules 36
Connector Interfaces and Other Accessories 36
Options 071, 021: Straight Contact Connectors 36
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 11
Table o f Co n ten t s
Specifications 39
Options 072, 022: Angled Contact Connectors 37
Definition of Terms 41
Absolute Wavelength Accuracy 41
Effective Linewidth 41
Linewidth 42
Minimum Output Power 42
Mode-Hop Free Tuning Range 42
Modulation Extinction Ratio 42
Modulation Frequency Range 43
Output Power 43
Output Isolation 43
Peak Power 43
Polarization Extinction Ratio 43
Power Flatness Over Modulation 44
Power Flatness Versus Wavelength 44
Power Linearity 44
Power Repeatability 44
Power Stability 45
Relative Intensity Noise (RIN) 45
Relative Wavelength Accuracy 45
Return Loss 45
Sidemode Suppression Ratio 46
Signal-to-Source Spontaneous Emission (SSE) Ratio 46
Signal-to-Total-Source Spontaneous Emission 46
Wavelength Range 47
Wavelength Repeatability 47
Wavelength Resolution 47
Wavelength Stability 47
Tunable Laser Module Specifications 48
Supplementary Performance Characteristics 54
Operating Modes 54
Internal Digital Modulation 1 54
External Digital Modulation 1 54
External Analog Modulation 1 54
External Wavelength Locking (Agilent 81680A/40A/82A/42A) 54
Coherence Control (Agilent 81680A/40A/82A/42A) 54
Continuous Sweep (Agilent 81680A/40A/82A/42A) 55
12 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Tab l e o f Co n t e n t s
Stepped Mode (Agilent 81680A/40A/82A/42A) 55
General 55
Output Isolation (typ.): 55
Return loss (typ.): 55
Polarization Maintaining Fiber (Options 071, 072): 55
Laser Class: 55
Recalibration Period: 56
Warm-up Time: 56
Environmental 56
Storage Temperature: 56
Operating Temperature: 56
Humidity: 56
Performance Tests 57
Required Test Equipment 59
Test Record 60
Test Failure 60
Instrument Specification 60
Performance Test Instructions 61
General Test Setup 61
Wavelength Tests 61
General Settings of Wavelength Meters for all Wavelength Tests 62
Wavelength Accuracy 62
Relative Wavelength Accuracy 62
Absolute Wavelength Accuracy 64
Mode Hop Free Tuning 64
Wavelength Repeatability 65
Power Tests 67
Calibration of the Agilent 81001FF Attenuation Filter 67
Maximum Output Power 69
Power Linearity 71
Power Linearity - Low Power Test 71
Example (Agilent 81680A Output 1) 73
Power Linearity - High Power Test 73
Power Linearity - Test Using Attenuation 75
Power Flatness over Wavelength 76
Power Flatness over Wavelength - Without Attenuation 76
Power Flatness over Wavelength - Using Attenuation 77
Power Stability 79
Signal-to-Source Spontaneous Emission 81
Signal-to-Source Spontaneous Emission Tests - High Power Outputs
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 13
Table o f Co n ten t s
81
Signal-to-Source Spontaneous Emission Tests - Low SSE Outputs 83
Signal-to-Total-Source Spontaneous Emission 88
Signal to Total SSE Tests - Low SSE Outputs 89
Optional Test 95
S i gna l t o To t al SS E Tes t s - H ig h P o we r Ou t pu ts 95
Te st Re c o r d 99
Agilent 81480A Performance Test 99
Test Equipment Used 100
Relative Wavelength Accuracy 101
Mode Hop Free Tuning 103
Wavelength Repeatability 104
Maximum Power Test 105
Power Linearity Output 1, Low SSE 106
Power Linearity Output 2, High Power Upper Power Levels 106
Power Linearity Output 2, High Power by attenuator 107
Power Flatness 108
Power Stability 109
Signal-to-Source Spontaneous Emission - 81480A Output 2, High
Power 109
Signal-to-Source Spontaneous Emission - 81480A Output 1, Low SSE
110
Signal-to-Total-Source Spontaneous Emission - 81480A Output 1, Low
SSE 111
Optional Test: Signal-to-Total-Source Spontaneous Emission - 81480A
Output 2, High Power 111
Agilent 81680A Performance Test 113
Test Equipment Used 114
Relative Wavelength Accuracy 115
Mode Hop Free Tuning 117
Wavelength Repeatability 118
Maximum Power Test 119
Power Linearity Output 1, Low SSE 120
Power Linearity Output 2, High Power Upper Power Levels 120
Power Linearity Output 2, High Power by attenuator 121
Power Flatness 122
Power Stability 123
Signal-to-Source Spontaneous Emission - 81680A Output 2, High
Power 123
Signal-to-Source Spontaneous Emission - 81680A Output 1, Low SSE
124
Signal-to-Total-Source Spontaneous Emission - 81680A Output 1, Low
SSE 125
Optional Test: Signal-to-Total-Source Spontaneous Emission - 81680A
14 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Tab l e o f Co n t e n t s
Output 2, High Power 125
Agilent 81640A Performance Test 127
Te s t E q ui pm en t Us e d 1 2 8
Relative Wavelength Accuracy 129
Relative Wavelength Accuracy Summary of all Repetitions 130
Relative Wavelength Accuracy Result 130
Absolute Wavelength Accuracy Result 130
Mode Hop Free Tuning 131
Wavelength Repeatability 132
Maximum Power Test 133
Power Linearity Output 1, Low SSE134
Power Linearity Output 2, High Power Upper Power Levels 134
Power Linearity Output 2, High Power by Attenuator 135
Power Flatness 136
Power Stability 137
Signal-to-Source Spontaneous Emission - 81640A Output 2, High
Power 137
Signal-to-Source Spontaneous Emission - 81640A Output 1, Low SSE
138
Signal-to-Total-Source Spontaneous Emission - 81640A Output 1, Low
SSE 139
Optional Test - Signal-to-Total-Source Spontaneous Emission - 81640A
Output 2, High Power 139
Agilent 81682A Performance Test 141
Te s t E q ui pm en t Us e d 1 4 2
Relative Wavelength Accuracy 143
Mode Hop Free Tuning 145
Wavelength Repeatability 146
Maximum Power Test 147
Power Linearity - 81682A 147
Power Linearity 81682A #003 Upper Power Levels 148
Power Linearity 81682A #003 by Attenuator 149
Power Flatness 150
Power Stability 151
Signal-to-Source Spontaneous Emission - 81682A 151
Optional Test: Signal-to-Total-Source Spontaneous Emission - 81682A
152
Agilent 81642A Performance Test 153
Te s t E q ui pm en t Us e d 1 5 4
Relative Wavelength Accuracy 155
Mode Hop Free Tuning 157
Wavelength Repeatability 158
Maximum Power Test 159
Power Linearity - 81642A 159
Power Linearity 81642A #003 Upper Power Levels 160
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 15
Table o f Co n ten t s
Cleaning Information 171
Power Linearity 81642A #003 by Attenuator 161
Power Flatness 162
Power Stability 163
Signal-to-Source Spontaneous Emission - 81642A 163
Optional Test: Signal-to-Total-Source Spontaneous Emission - 81642A
164
Agilent 81689A Performance Test 165
Tes t E qui pme nt U s ed 1 66
Relative Wavelength Accuracy 167
Wavelength Repeatability 168
Maximum Power Test 169
Power Linearity 169
Power Flatness 170
Power Stability 170
Signal-to-Source Spontaneous Emission 170
Safety Precautions 173
Why is it important to clean optical devices? 173
What do I need for proper cleaning? 174
Standard Cleaning Equipment 174
Dust and shutter caps 174
Isopropyl alcohol 175
Cotton swabs 175
Soft tissues 176
Pipe cleaner 176
Compressed air 176
Additional Cleaning Equipment 177
Microscope with a magnification range about 50X up to 300X 177
Ultrasonic bath 177
Warm water and liquid soap 178
Premoistened cleaning wipes 178
Polymer film 178
Infrared Sensor Card 178
Preserving Connectors 179
Cleaning Instrument Housings 179
Which Cleaning Procedure should I use ? 180
How to clean connectors 180
How to clean connector adapters 181
How to clean connector interfaces 182
16 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Tab l e o f Co n t e n t s
How to clean bare fiber adapters
183
How to clean lenses 184
How to clean instruments with a fixed connector interface
184
How to clean instruments with an optical glass plate 185
How to clean instruments with a physical contact interface
185
How to clean instruments with a recessed lens interface
186
How to clean optical devices which are sensitive to
mechanical stress and pressure
187
How to clean metal filters or attenuator gratings 188
Additional Cleaning Information 189
How to clean bare fiber ends 189
How to clean large area lenses and mirrors 189
Other Cleaning Hints 191
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 17
Table o f Co n ten t s
18 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
List of Figures
Figure 1 USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A) . . 6
Figure 2 Non-USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A) 6
Figure 3 Position of Safety Labels on Backloadable Tunable Laser Modules . . . 7
Figure 4 Position of Safety Labels on Agilent 81689A Tunable Laser Module . . . 7
Figure 5 Agilent 81480A Tunable Laser Module (straight contact connectors) . . . 24
Figure 6 Agilent 81680A Tunable Laser Module (straight contact connectors) . . . 24
Figure 7 Agilent 81682A Tunable Laser Module (straight contact connector) . . . 24
Figure 8 Agilent 81640A Tunable Laser Module (straight contact connectors) . . . 24
Figure 9 Agilent 81642A Tunable Laser Module (straight contact connectors) . . . 24
Figure 10 Agilent 81689A Tunable Laser Module . . . . . . . . . . 26
Figure 11 PMF Output Connector . . . . . . . . . . . . . . 27
Figure 12 Angled and Straight Contact Connector Symbols . . . . . . . . 28
Figure 13 Agilent 81682A Tunable Laser Module (angled contact connector) . . . 28
Figure 14 Mainframes, Tunable Laser Modules, and Options . . . . . . . 33
Figure 15 Options 021, 071: Single-mode fiber/PMF with Straight Contact Connectors . 37
Figure 16 Options 022, 072: Single-mode fiber/PMF with Angled Contact Connectors . 38
Figure 17 Test Setup for Wavelength Tests . . . . . . . . . . . . 61
Figure 18 Calibration of the Agilent 81001FF Attenuation Filter, Reference Setup . . 67
Figure 19 Test Setup for Calibrating the Agilent 81001FF Attenuation Filter . . . . 68
Figure 20 Test Setup for the Maximum Output Power Tests. . . . . . . . 69
Figure 21 Test Setup for Low Power Linearity Tests. . . . . . . . . . 71
Figure 22 Test Setup for the Source Spontaneous Emission Test - High Power Outputs . 81
Figure 23 Transmission Characteristic of Fiber Bragg Grating . . . . . . . 84
Figure 24 Signal-to-Spectral SSE Measurement . . . . . . . . . . 84
Figure 25 Test Setup for Source Spontaneous Emission Test . . . . . . . 85
List of Figures
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 19
List of Figures
20 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Getting Started with Tunable Laser Sources
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 21
Getting Started with Tunable Laser Sources
This chapter describes the Agilent 81480A, Agilent 81680A,
Agilent 81640A, Agilent 81682A, Agilent 81642A, and Agilent 81689A
Tunable Laser modules.
22 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
What is a Tunable Laser ? Getting Started with Tunable Laser Sources
What is a Tunable Laser ?
A Tunable Laser is a laser source for which the wavelength can be
varied through a specified range. The Agilent Technologies range of
Tunable Laser modules also allow you to set the output power, and to
choose between continuous wave or modulated power.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 23
Getting Started with Tunable Laser Sources What is a Tunable Laser ?
Agilent 81480A, 81680A/82A/40A/42A
Tunable Las er Modules
Figure 5 Agilent 81480A Tunable Laser Module (straight contact connectors)
Figure 6 Agilent 81680A Tunable Laser Module (straight contact connectors)
Figure 7 Agilent 81682A Tunable Laser Module (straight contact connector)
Figure 8 Agilent 81640A Tunable Laser Module (straight contact connectors)
Figure 9 Agilent 81642A Tunable Laser Module (straight contact connectors)
24 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
What is a Tunable Laser ? Getting Started with Tunable Laser Sources
The Agilent 81480A and 81680A/82A/40A/42A Tunable Laser
modules are back-loadable modules. To fit these modules into the
Agile nt 8164A mainframe see “How to Fit and Remove Modules” in th e
Agilent 8163A Lightwave Multimeter, Agilent 8164A, Lightwave
Measurement System, & Agilent 8166A Lightwave Multichannel
SystemUser’s Guide.
The Agilent 81480A and 81680A/82A/40A/42A Tunable Laser
modules have a built-in wavelength control loop to ensure high
wavelength accuracy. As these modules are all mode-hop free tunable
with continuous output power, they qualify for the test of the most
critical dense-Wavelength Division Multiplexer (dWDM) components.
The Agilent 81480A and Agilent 81640A/80A Tunable Laser modules
are equipped with two optical outputs:
• Output 1, the Low SSE output, delivers a signal with ultra-low
source spontaneous emission (SSE). It enables accurate crosstalk
measurement of DWDM components with many channels at narrow
spacing. You can characterize steep notch filt ers such as Fiber
Bragg Gratings by using this output and a power sensor module.
• Output 2, the High Power output, delivers a signal with high optical
power. You can adjust the signal by more than 60 dB by using the in-
built optical attenuator.
The Agilent 81682A/42A Tunable Laser module delivers a signal with
high optical power. If you choose O ption 0 03 , you can adjust the signal
by more than 60 dB by using the in-built optical attenuator.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 25
Getting Started with Tunable Laser Sources What is a Tunable Laser ?
Agilent 81689A Tunable Laser Module
Agilent 81689A with
Straight Contact Connector
Figure 10 Agilent 81689A Tunable Laser Module
The Agilent 81689A Tunable Laser module is a front-loadable module.
To insert this module into the Agilent 8163A Lightwave Multimeter,
Agilent 8164A Lightwave Measurement System or Agilent 8166A
Lightwave Multichannel System see “How to Fit and Remove Modu les”
in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave
Measurement System, & Agilent 8166A Lightwave Multichannel
System User’s Guide.
You can use the Agilent 81689A Tunable Laser module to set up a
realistic multi-channel test-bed for DWDM transmission systems. Its
continuous, mode-hop free tuning makes it quick and easy to set even
the most complex configurations to the target wavelengths and power
levels.
The Agilent 8163A Lightwave Multimeter, a Power Sensor module,and
a Agilent 81689A Tunable Laser module together represent a smart
loss-test set with selectable wavelength.
Agilent 81689A with
Angled Contact Connector
26 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Optical Output Getting Started with Tunable Laser Sources
Optical Output
Polarization Maintaining Fiber
If you have an instrument with a polarization maintaining fiber (PMF),
the PMF is aligned to maintain the state of polarization.
The fiber is of Panda type, with TE mode in the slow axis in line with
the connector key. A well defined state of polarization ensures
constant measurement conditions.
The Agilent 81480A and 81680A/40A/82A/42A Tunable Laser
modules are equipped with PMF outputs as standard.
For the Agilent 81689A Tunable Laser module, PMF output is available
as an option.
Stress Rods
Figure 11 PMF Output Connector
Angled and Straight Contact Connectors
Angled contact connectors help you to control return lo ss. With angled
fiber endfaces, reflected light tends to reflect into the cladding,
reducing the amount of light that reflects back to the source.
E
Connector Key
Fiber Cladding
H
Fiber Core
(8-µm Diameter)
Slow Axis (Polarization Axis)
Not to Scale
The Agilent 81480 and 81680A/40A/82A/42A/89A Tunable Laser
modules can have the following connector interface options:
• Option 071, Polarization-maintaining fiber straight contact
connectors, or
• Option 072, Polarization-maintaining fiber angled contact
connectors.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 27
Getting Started with Tunable Laser Sources Optical Output
Two additional connector interface options are available for the
Agilent 81689A Tunable Laser module:
• Option 021, Standard single-mode fiber straight contact connectors,
or
• Option 022, Standard single-mode fiber angled contact connectors.
CAUTION If the contact connector on your instrument is angled, you can only
use cables with angled connectors with the instrument.
Angled Contact
Connector Symbol
Figure 12 Angled and Straight Contact Connector Symbols
Figure 12 shows the symbols that tell you whether the contact
connector of your Tunable Laser module is angled or straight. The
angled contact connector symbol is colored green.
Figure 7 and Figure 13 show the front panel of the Agilent 81682A
Tunable Laser module with straight and angled contact connectors
respectively.
You should connect straight contact fiber end connectors with neutral
sleeves to straight contact connectors and connect angled contact fiber
end connectors with green sleeves to angled contact connectors.
NOTE You cannot connect angled non-contact fiber end connectors with
orange sleeves directly to the instrument.
Straight Contact
Connector Symbol
Figure 13 Agilent 81682A Tunable Laser Module (angled contact connector)
See “Accessories” on page 31 for further details on connector
interfaces and accessories.
28 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Signal Input and Output Getting Started with Tunable Laser Sources
Signal Input and Output
CAUTION There are two BNC connectors on the front panel of the
Agilent 81480A, Agilent 81680A, Agilent 81680A, Agilent 81640A,
Agilent 81682A, and Agilent 81642A - a BNC input connector and a
BNC output connector.
There is one BNC connector on the front panel of the Agilent 81689A a BNC input connector.
An absolute maximum of ±6 V can be applied as an external voltage to
any BNC connector.
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 29
Getting Started with Tunable Laser Sources Signal Input and Output
30 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
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